const grpc = require('@grpc/grpc-js')
const message_proto = require('./proto')
const const_module = require('./const')
const {v4 : uuidv4} = require('uuid')
const emailModule = require('./email')
const Redis_module = require('./redis')

async function GetVarifyCode(call, callback) {
    console.log("email is ", call.request.email)
    try{
        const query_res = await Redis_module.GetRedis(const_module.code_prefix+call.request.email);
        console.log("query_res is ", query_res)
        let uniqueId = query_res; 
        if(query_res==null){
            uniqueId = uuidv4();
            if(uniqueId.length>=4){
                uniqueId = uniqueId.substring(0,4);
            }
            let bet = await Redis_module.SetRedisExpire(const_module.code_prefix+call.request.email,uniqueId,300);
            if(!bet){
                callback(null,{
                    email:call.request.email,
                    error:const_module.Errors.RedisErr
                });
                return;
            }
            
        }
        console.log("uniqueId is ", uniqueId)
        let text_str =  '您的验证码为  '+ uniqueId +'  请五分钟内完成注册'
        //发送邮件
        let mailOptions = {
            from: '18016169453@163.com',
            to: call.request.email,
            subject: '验证码',
            text: text_str,
        };
        let send_res = await emailModule.SendMail(mailOptions);
        console.log("send res is ", send_res)
        callback(null, { email:  call.request.email,
            error:const_module.Errors.Success
        }); 
    }catch(error){
        console.log("catch error is ", error)
        callback(null, { email:  call.request.email,
            error:const_module.Errors.Exception
        }); 
    }
}
function main() {
    var server = new grpc.Server()
    server.addService(message_proto.VarifyService.service, { GetVarifyCode: GetVarifyCode })
    server.bindAsync('127.0.0.1:50051', grpc.ServerCredentials.createInsecure(), () => {
        server.start()
        console.log('grpc server started')        
    })
}
main()